Description of problem:
If cfme retire machine automatically or manually, we can define to remove the entire disk data from datastore / hypervisor or not, case not and talking about vCenter, the vm will be removed from the 
inventory btw the vm data will be available in the datastore. After restore the .vmx to the inventory, it's possible to see the *R* in the machine *Retired* but it's not possible to start/power on the machine 
again.

Version-Release number of selected component (if applicable):
latest appliance

How reproducible:
100%

Steps to Reproduce:
1. Retire the vm leaving all data into the datastore
2. Restore the machine to the inventory
3. Update the cfme screen, after this, it's possible to see the vm as *Retired*, so without Power On button.
4. How to change the state from Retired to None and then machine come back to start process ?!


Actual results:
Machine still in the Retired state

Expected results:
Machine ready to start again

Additional info: